diff --git a/module/Makefile b/module/Makefile
index 74cdf077..d595cc49 100644
--- a/module/Makefile
+++ b/module/Makefile
@@ -1,11 +1,13 @@
 obj-m += kvmfr.o
 USER  := $(shell whoami)
+KVER ?= $(shell uname -r)
+KDIR ?= /lib/modules/$(KVER)/build
 
 all:
-	make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) modules
+	make -C $(KDIR) M=$(PWD) modules
 
 clean:
-	make -C /lib/modules/$(shell uname -r)/build/ M=$(PWD) clean
+	make -C $(KDIR) M=$(PWD) clean
 
 test:	all
 	grep -q '^uio'   /proc/modules || sudo modprobe uio